Filament apparatus.



` Schenectady, county of Schenectady, State ofNeW York, have invented certain new-and desclngfilament.

v` solidateor sinter the same, there occui's a fi ament, and may even 'give rise to shortdown when in'a softened condition and will ture,' and hence 1f a we1g.ht wereplaced Ward po1nted by hanging a weight upon 40 method Whereby `the filamentis given a symwit the Weight after it has gaincd suflsAMuEL nERc-Usoixr, cr scHnNEcTaDY, NEW YORK, ssIGNoR 'ro GENERAL EIEGTRIC COMPANY, A CORPORATION or NEW YORK.

FILAMENT APPRATUS.

190239305, Specification of Letters I' atent.V Patented Apr, Application filed February 3, 1903. Serial No. 413,990.

Figure 1' shows a treating bottle and fa front view of.the clamping device; Fig. 2 shows the clamp and the filament With the .suspended weight in perspective; and I'ig. 3 illustrates more fullyhow the weight is picked'up by the filament.`

To c't may concern: Be it lmown that I, SAMUEL FERGUSON, a citizen of :the United States, residing at s invention relates to the productionof a symmetrical ;form a metallic incanfractory conductors oft gsten. 6.5

According to one method of making tungsten filaments a Vaporizable alloy' composed of cadmium 42%, mercury and bisen as a final ,step in the manufacture of refractory filaments, ;the filaments are heatedoto a high temperature in a vacuum or 'a suitable atmosphere, in order to contory material, as tungsten. lhe tungsten 7,0 may be added to the extent of 30 to 4:0 per cent. by weight of the final mixture. The mass is then squirted into filaments These vcontraction or shortenlng of the filaments.

is undesirable, as it results in an unsightly izes part of the metalhc binder. The par- '75 circui'ting in the same. The difliculty may efiovercome by suspending a weight on its lower'end ,andagain bringing it to incandeseence. The'llament will then be drawn w so as to heat t e same and vaporize the re- .80 be made' symmetrical. According to some processes of manufacturing refractory metal filaments, the filament is Very fragile before 4 eing sintered together at a high temperatory metal. The heating in 'Vacnum' here described is known as treating. It ;is vB5 during this 'ti'eating process that distortion of shape isliable to occur in the filament. f

In carrying out my invention'I place in hazard of breaking the filament would be inci'eased. In this case Jthe fila'ment must st be consolidated by smtering and afterport'ing rods 2, a tube 3 which has a slot 4, extending down a part of its length. In this slot avweight or rider 5 is hung. The slotted tube serves as a guide so that the rider will always be in the desired position. The filament while suspended from the clamp 6, its lower end being below the weight 5, is raised to incandescence by the passage lof a current. s it sinters together lt and again raising it to a high temperature. It is obvious that this double treatment is not only .troublesome but expensive. i

y inv'ention comprises a device and a vmetrical shape and operates by allowin' the looped 'end of the filamentto engage With a weight .as it is drawn up during the sini'ering process. The filament thus engages cient strength to ,bear the same. This method of pcinting the filament possesses the additional advantage 'that a separate traction of the filament has already taken handling of the Weight in each case .is not place, and its lower end has comeinto en- 0 required. gagcment with the weight 5. The metallic 10.5

The novel features of my inventlon Will filament being' in a softenedcondition, this bepointed out inthe appended claims. weight draws or points it into the regular he following' description taken in con- I shape as shown in the drawing. nectionwvith the accompanying drawing'will Tt is obvious that my invention Will' be the t'reating Chamber l, between the sup- 30.

and shrlnks 111 length, 1t engages the rider 1.00

i serve tlrmore fully explain my invention. found useful in any process of producing'll softened condition ar con'in' shrinlragc by a r ture.

8. he conihination ei' incnt support ing means, means iior heati. 'a'iiarnent sosn pended there'h'om9 and a weight placed in the path along; 'hich the iiiament moves in metallie ilaments in which, as a iinal step in the process, the ilament is sintered toget-her at a high temperature; theretore'a do not wish to he limited in its application to the particular process described in connection therewit ililhat claim as new and desire to secure by Letters Patent of the United States, 1s,-- shrinking in length under ae niuence of a i. The method which consists `in passing high teinperature,said 'h' 'i .ng initiaiiy current through a suspenc i filamentary ont ot engagement w c'nent and body to vaporize out a bin contained in .engaging said filair'- it and consolidate the r 'r cansing the filament to cor ing lthe Vaporization and n al consohdation and then causing a load be imposed on' the filament after removai or the bioder. '2 rhe method which consists in passing current through asuspended metallic ilaeled a, predeter nient whereby it is heated and causing it of 'the {ilament, i'irst to contract reely 'and then tO aSSume Symmetrical Shape.

a load when urther contracting under the 10. The method w iniiuence of high temperature. ing a ilanientary hen); i 31 The comrnnation of an enveiop, means treatment the 't Awhich invoiVa-s 'for supporting a metallic filarnent, means sintering while the body is :tree to contract 'for passing current therethrough, means tor and change its she-ge and the letter part ot suspending a weight or rider in the path'o which involves co tinuing sinterinz; and said filament to engage therewith when the causing 'force tendm; to give it a desired ilarnent shrinks. Shape to he brought into action upon. it duri. 'the Combination of :i i'eiiting Gnviop, ing the latter partojt' such trentmen so means Jor suspending a ilament in the same, 11. The method which consists in subjectmeans for passing current therethrough, a. ing a ilanientary hody to continuous heat tube and a rider suspended in said tnie treatment durin` which it shrinls, leaving' above the looped end o'f the ilament. it free to contract and to change. its Shape 5. The method which consists .in passing during the tir-st part ot' the treatment and currentthrough a snspen ed metallic filacausing` a force iacting to shape it to he ment' to heat and consolidate it, causing it to contract 'freely during its i'nitial consoliresidue,

termined shrin rct 'freely dur- 9. The comeing a filament loop in the path of 'the of engagement ing with the i mnsiets in sni'ricctcf itinuous 'heat brought into action upon itduring the latter part ot the treatment in consequence ot dation and then causlng it to assume a such shrinkage. gravitational load tending to give it a sym- 12. rl`he method which consists in subject- 40 metrical form after it has consolidated sufiino' a iilan'ientary hody to continuous ireat' cientljy to bear such load. ment during which it is very weak and sub- (3. 'lhe process of treating a 'fragile ilaseqnently shrinks iand l:cc,omcs stronger, ment which consists in incandescing said leaving it free to contrzu't and to change its tilanient to partially consolidate the same Shape during the first part of the treatment permittine' said filament to contract freely and thereatter causing a force tending to under said partial consolidation. and then give it a desired Shape to be brought into applying a 'straightening Jforce to said filaaction upon it, while itris under treatment ment and continuiug,` the consolidatioii by. in oonsequencc ot shrinlmge corresponding; a progressive increase of temperature while to the possession oi 'strei'igth adequate to said straighteni'ng force remains applied. sustain such force.

7. The 'process of sintering a rc'fractory in witness whereoii, I. have hcreunto set metlallic filament which coisi ts in heating my hand this flst day of: January, 1908. saic. lament b assaee ol current to coni solidate and shi' irii; thesame permitting the SAMU L RU EON' filarnent initially to Shrink reely and withi/Vitnesscs'.

` HnLuN Onronn,v

BENJAMIN ii. lluim.

out restraint and then placing said iilament under slight tension while still hot and in a o K U U 

